Add conditional line to MailMessage (#43387)

Author: shino47

src/Illuminate/Notifications/Messages/SimpleMessage.php

@@ -157,6 +157,22 @@ public function line($line)
         return $this->with($line);
     }
 
+    /**
+     * Add a line of text to the notification if the given condition is true.
+     *
+     * @param  bool  $boolean
+     * @param  mixed  $line
+     * @return $this
+     */
+    public function lineIf($boolean, $line)
+    {
+        if ($boolean) {
+            return $this->line($line);
+        }
+
+        return $this;
+    }
+
     /**
      * Add lines of text to the notification.
      *
@@ -172,6 +188,22 @@ public function lines($lines)
         return $this;
     }
 
+    /**
+     * Add lines of text to the notification if the given condition is true.
+     *
+     * @param  bool  $boolean
+     * @param  iterable  $lines
+     * @return $this
+     */
+    public function linesIf($boolean, $lines)
+    {
+        if ($boolean) {
+            return $this->lines($lines);
+        }
+
+        return $this;
+    }
+
     /**
      * Add a line of text to the notification.
      *